Dynamic Routes in json-server with CORS enabled for API server

app.js

const dynamicMiddleware = require( 'express-dynamic-middleware' )
const jsonServer = require( "json-server" )

const jsonFile = "db.json"

const server = jsonServer.create()
let router = jsonServer.router( jsonFile )
let dynamicRouter = dynamicMiddleware.create( router )
const defaults = jsonServer.defaults()

server.use( '/:name', function ( req, res, next ) {
  if ( req.method === 'POST' ) {
    if ( !router.db.get( req.params.name ).value() ) {
      router.db.defaults( { [req.params.name]: [] } ).write()
      dynamicRouter.unuse( router )
      router = jsonServer.router( jsonFile )
      dynamicRouter = dynamicMiddleware.create( router )
      server.use( dynamicRouter.handle() )
    }
  }
  next()
} )

server.use( defaults )
server.use( dynamicRouter.handle() )

server.listen( 8899, () => {
  console.log( 'API listening on port 8080.' )
} )

package.json

{
  ...
  "dependencies": {
    "body-parser": "^1.20.0",
    "cors": "^2.8.5",
    "express-dynamic-middleware": "^1.0.0",
    "json-server": "^0.17.0"
  }
}